Address. 257 East Town Street, Suite 457, Columbus, Ohio 43215-4626 ; Phone. 877-644-6457. Participants with questions should contact the Service Center at 877.644.Forms and Help. Forms. Help. Get the help you need Call 877-644-6457 to talk to our Service Center if you need help updating your personal information. Ohio Deferred Compensation is a supplemental 457(b) retirement plan for all Ohio public employees. It provides participants with educational tools. Phone Numbers. 937-645-3106.